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Use shape capacity transition for class ivars

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This commit changes class ivars to respect the capacity transition in
shapes rather than growing the capacity independently.
This commit is contained in:
Peter Zhu 2023-11-02 11:01:35 -04:00
parent 38ba040d8b
commit 4c3cc25ea2
1 changed files with 31 additions and 25 deletions
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56
variable.c
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@ -4152,44 +4152,50 @@ rb_class_ivar_set(VALUE obj, ID key, VALUE value)
rb_shape_t * shape = rb_shape_get_shape(obj);
if (shape->type == SHAPE_OBJ_TOO_COMPLEX) {
found = rb_complex_ivar_set(obj, key, value);
goto finish;
}
else {
attr_index_t idx;
found = rb_shape_get_iv_index(shape, key, &idx);
if (found) {
// Changing an existing instance variable
RUBY_ASSERT(RCLASS_IVPTR(obj));
attr_index_t idx;
found = rb_shape_get_iv_index(shape, key, &idx);
RCLASS_IVPTR(obj)[idx] = value;
RB_OBJ_WRITTEN(obj, Qundef, value);
}
else {
// Creating and setting a new instance variable
if (!found) {
idx = shape->next_iv_index;
// Move to a shape which fits the new ivar
idx = shape->next_iv_index;
rb_shape_t * next_shape = rb_shape_get_next(shape, obj, key);
if (UNLIKELY(idx >= shape->capacity)) {
RUBY_ASSERT(shape->next_iv_index == shape->capacity);
rb_shape_t *next_shape = rb_shape_transition_shape_capa(shape);
if (next_shape->type == SHAPE_OBJ_TOO_COMPLEX) {
rb_evict_ivars_to_hash(obj, shape);
rb_complex_ivar_set(obj, key, value);
goto finish;
}
else {
// We always allocate a power of two sized IV array. This way we
// only need to realloc when we expand into a new power of two size
if ((idx & (idx - 1)) == 0) {
size_t newsize = idx ? idx * 2 : 1;
REALLOC_N(RCLASS_IVPTR(obj), VALUE, newsize);
}
RUBY_ASSERT(RCLASS_IVPTR(obj));
REALLOC_N(RCLASS_IVPTR(obj), VALUE, next_shape->capacity);
RB_OBJ_WRITE(obj, &RCLASS_IVPTR(obj)[idx], value);
rb_shape_set_shape(obj, next_shape);
}
shape = next_shape;
RUBY_ASSERT(shape->type == SHAPE_CAPACITY_CHANGE);
}
rb_shape_t *next_shape = rb_shape_get_next(shape, obj, key);
if (next_shape->type == SHAPE_OBJ_TOO_COMPLEX) {
rb_evict_ivars_to_hash(obj, shape);
rb_complex_ivar_set(obj, key, value);
goto finish;
}
else {
rb_shape_set_shape(obj, next_shape);
RUBY_ASSERT(next_shape->type == SHAPE_IVAR);
RUBY_ASSERT(idx == (next_shape->next_iv_index - 1));
}
}
RUBY_ASSERT(RCLASS_IVPTR(obj));
RB_OBJ_WRITE(obj, &RCLASS_IVPTR(obj)[idx], value);
}
finish:
RB_VM_LOCK_LEAVE();
return found;